Question

Maria was going to sell all of her stampcollection to buy a video game. Afterselling half of them she changed her mind.She then bought eleven more. How manydid she start with if she now has 41?Help?

Answer 1

`\begin{gathered} \text{Let's she start with x.} \\ \text{She sold half of them, so remaing is}\Rightarrow(x)/(2) \\ \text{then she bought 11 more, now}\Rightarrow(x)/(2)+11 \\ \text{Then,}\Rightarrow(x)/(2)+11=41 \\ (x)/(2)=41-11 \\ (x)/(2)=30 \\ x=60\text{ stamp} \end{gathered}`